NDLI: Tuning glycolide as an SEI-forming additive for thermally robust Li-ion batteries

Content Provider	Royal Society of Chemistry (RSC)
Author	Park, Taeyoon Kang, Sunwoo Lee, Hochun Jeon, Jongho Cho, Jeong-Ju Yoon, Soojin Han, Young-Kyu
Copyright Year	2012
Abstract	A series of glycolide derivatives, glycolide (GL00), 3-methyl glycolide (GL01), 3,6-dimethyl glycolide (GL11) and 3,3,6,6-tetramethyl glycolide (GL22), are examined as SEI-forming electrolyte additives for LiCoO2/graphite lithium-ion batteries (LIBs). The novel additives are also compared with vinylene carbonate (VC), the currently most popular SEI-forming additive in LIBs. Through both density functional calculations and electrochemical experiments, it is confirmed that the number of methyl groups systematically affects anodic stability and the SEI-forming reaction of the glycolide additives. The cyclability of the LiCoO2/graphite cell is improved in the following order: VC ≥ GL00 ≥ GL01 > GL11 > GL22. With elevated temperature (90 °C) storage, however, the Al-pouch cells with VC and GL00 suffer from severe swelling, whereas the cells with GL01 and GL11 show reasonable dimensional stabilities. Both the good cyclability and the excellent thermal stability of GL01 make it the most appropriate SEI additive for the present LiCoO2/graphite chemistry.
Starting Page	21003
Ending Page	21008
Page Count	6
File Format	HTM / HTML PDF
ISSN	09599428
Volume Number	22
Issue Number	39
Journal	Journal of Materials Chemistry
DOI	10.1039/c2jm34191c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Methyl group Electrolyte Graphite Lithium-ion battery Vinylene group Venture capital Electrochemistry Organic chemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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